/* Black Scholes Calculator */
* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0c4a6e 0%, #0f172a 100%);
    color: #e2e8f0;
    min-height: 100vh;
    padding: 20px;
}

.widget {
    max-width: 600px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

header {
    padding: 20px;
    background: linear-gradient(90deg, #0891b2, #0e7490);
    color: white;
}

header h1 {
    margin: 0 0 8px 0;
    font-size: 1.5rem;
}

header p {
    margin: 0;
    opacity: 0.9;
}

main {
    padding: 20px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 12px;
    color: #94a3b8;
    margin-bottom: 5px;
}

.input-group input {
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    color: white;
    font-size: 14px;
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: #0891b2;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 20px;
}

button:hover {
    background: #0e7490;
}

.results {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.result-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.result-box .value {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    color: #10b981;
    margin-top: 5px;
}

footer {
    padding: 15px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 12px;
    color: #64748b;
}